@article{JMLR:v10:takacs09a,
  author  = {G{{\'a}}bor Tak{{\'a}}cs and Istv{{\'a}}n Pil{{\'a}}szy and Botty{{\'a}}n N{{\'e}}meth and Domonkos Tikk},
  title   = {Scalable Collaborative Filtering Approaches for Large Recommender Systems},
  journal = {Journal of Machine Learning Research},
  year    = {2009},
  volume  = {10},
  number  = {22},
  pages   = {623--656},
  url     = {http://jmlr.org/papers/v10/takacs09a.html}
}